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 Post subject: Coronado 803
PostPosted: May Sat 09, 2020 8:56 am 
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Location: saint clair shores, michigan
I picked this up Coronado 803-B a while back. I started looking at it the other day. I noticed a vibrator on the chassis. Looking at the schematic, it shows power supplies of 120 AC or 6 DC. Why 6 volts? I saw one site on the internet that referred to it as rare. True? I guess the difference between an A and a B is the speaker. Mine has a PM speaker.


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 Post subject: Re: Coronado 803
PostPosted: May Sat 09, 2020 9:19 am 
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Rural section of the country hadn't been electrified yet. Usually sets were either one or the other. This would be a good purchase if you were expecting electrification to your house.


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 Post subject: Re: Coronado 803
PostPosted: May Sat 09, 2020 9:47 am 
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Location: Mountains of Mourne. Ireland.
So it could be powered from a (single) 6V DC storage battery or 105V to 125V AC line Voltage.

President Roosevelt created the Rural Electrification Administration (REA) on May 11, 1935 with Executive Order No. 7037, under powers granted by the Emergency Relief Appropriation Act of 1935
The goal of the REA was to bring electricity to America's rural areas.

Your set was manufactured for Gambles around 1939 - - probably by Belmont Radio.


Thanks to hard work and REA loans, by 1950 close to 80 percent of U.S. farms had electric service.

Image

Greg.


http://www.nostalgiaair.org/Resources/156/M0007156.htm


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 Post subject: Re: Coronado 803
PostPosted: May Sat 09, 2020 10:20 am 
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Radios in "small town USA" 1939
Beaver Dam, Wisconsin.

one-page... https://americanradiohistory.com/hd2/ID ... e-0015.pdf


Greg.


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 Post subject: Re: Coronado 803
PostPosted: May Sat 09, 2020 5:32 pm 
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Thanks for the replies, guys. Great info. Cool pictures, egg. I know there were windmill powered generators sold for power in that era. I assume they were used to recharge the battery. What other methods of recharging were employed? I suppose the TVA had a big part in producing the electricity.

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 Post subject: Re: Coronado 803
PostPosted: May Sat 09, 2020 5:43 pm 
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A lot of farmers bought a second 6 volt battery identical to the one in their truck or tractor to power the home radio. They would switch them out every few days so the vehicle could recharge the battery as it was being driven. Otherwise the only option was to drive into town where there was electricity, and have the battery recharged, unless they could afford a wind charger.

There was also a different DC farm power system, which operated at 32 volts.

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 Post subject: Re: Coronado 803
PostPosted: May Sat 09, 2020 6:47 pm 
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Here is a 2 Volt EVEREADY Air Cell "A" battery - - filament supply, also in 1939

Image

Large image... https://www.shorpy.com/node/13182


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 Post subject: Re: Coronado 803
PostPosted: May Sat 09, 2020 8:44 pm 
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I love the contrast in that picture of the radio on the same table with oil lamps. I seem to remember a scene from Coal Miners Daughter about running down the radio battery from listening to music, which was considered non essential listening. I looked at some sites about the 32 V systems. Makes me wonder how many and which devices were made for that voltage. It seems like because of the limits of batteries that a lot of high amperage appliances would be out of the question.

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 Post subject: Re: Coronado 803
PostPosted: May Sat 09, 2020 8:52 pm 
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Maytag, and possibly others, sold washing machines with gasoline engine power. Those are still popular even now with people having cabins which are miles out in the woods that will never have electricity.

Servel and later Whirlpool sold full sized (for the era) refrigerators based upon the absorption system which actually works really well and only uses a small amount of propane/LP gas to operate. No electricity required. A lot of those have survived as well and are still in use.

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 Post subject: Re: Coronado 803
PostPosted: May Sat 09, 2020 11:26 pm 
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I have a problem with this post. I started out with questions I thought suitable for the Antique Radio Discussions forum, but now I have questions that would normally be posted in the Electrical/Mechanical forum. There is a rule that specifies one post per radio. Do I post those questions here? Will the thread then be moved by the moderator if I post those questions here?

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 Post subject: Re: Coronado 803
PostPosted: May Sat 09, 2020 11:53 pm 
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Just ask your question here. If a moderator feels the need to move it they will.

It will hardly be the crime of the century... :)
anyway... they're all pussycats. lol
8) Greg.


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 Post subject: Re: Coronado 803
PostPosted: May Sat 09, 2020 11:54 pm 
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Relax, we H/J thread discussions here all the time. Go ahead and post your questions.

Here's Zenith's answer to renewable power, propeller not shown;

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 Post subject: Re: Coronado 803
PostPosted: May Sun 10, 2020 12:33 am 
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The tube location label on the chassis and the schematic show a 6T7GT tube, but in that socket resides a 6Q7GT. I don't see them as direct replacements in an online cross reference guide. Can the 6Q7GT be used as a replacement without any circuit modifications? The reason I found the substitution is because I can't see a dial lamp on the schematic, so to try and find it I traced the radio's lamp wire to pin 7 of that tube. I still don't see it on the schematic. Does anyone know which lamp would be used? The socket is empty. Since that is a heater pin the lamp is connected to should the lamp be 6.3 volts?
There is only 4 inches of wire coming from the radio for power, hence no plug or alligator clips to indicate source of power. According to the schematic it is configured for 6 volts DC. I wonder if it is unusual for a dual power radio to have never been converted to AC? That also makes me wonder if this radio hasn't been powered up in quite a long time. Obviously I will be configuring it for 110 AC. Many moons ago the filter caps were replaced.
I like the pic of the generator fin.
Thanks to all, Mike.

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 Post subject: Re: Coronado 803
PostPosted: May Sun 10, 2020 1:02 am 
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The two tubes are similar.
https://frank.pocnet.net/sheets/127/6/6T7G.pdf

Greg.


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 Post subject: Re: Coronado 803
PostPosted: May Sun 10, 2020 1:56 am 
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I was actually on that exact same page before posting my last reply. The wording is vague to me. Does similar mean interchangeable?

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 Post subject: Re: Coronado 803
PostPosted: May Sun 10, 2020 1:59 am 
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In this set, the 6T7 and 6Q7 would be interchangeable if you were running it on AC and there would be no difference in operation..

The 6T7 has a 150ma filament, the 6Q7 a 300ma filament. Therefore if you were running it on a 6 volt battery supply, it would be desirable to have the 6T7 since it draws less current which would equal longer running time before discharging the battery. On AC power, it doesn't matter.

In a different radio, one that had the filaments connected in series, you couldn't make the substitution but that doesn't apply to the Coronado 803.

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